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Hi, I'm new here, so hopefully this is in the right section. anyway i was reading this topic: http://www.newninja.com/modifications/hmf-slip-on-review-%28picsvids%29/
I'm going to be getting a 2009 Ninja 250R and was thinking of getting an HMF slip on for it. I'm a completely new rider with no clue about exhausts. (but hey we all have to start some time). while reading that topic i heard a couple terms i did not understand, such as re-jetting and shimming the needles. if you have anything else you think i should know as well, feel free to post it. thanks.
 

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rejetting and shimming the needles both relate to the metal needles inside your carbeuretter that control fuel intake or richness inside your engine.
A new exhaust will generally increase air flow and compression which will allow or possibly require more fuel, So the needles will need replacing (Re-jetting) or your current needles will need adjusting (shimming)

Anything else you need to know? Don't get the HMF. :p Two Bro's, Yoshi, Area P.
 
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